General Report on Tunny


24D Page 124

(e) E 2. (R2 p 82, R3 p 74, R4 pp 4, 20.)

Select the five best rows, as for 9 x 5 flag: A, B, C, D, E.

In A take all scores above the standard (see below) to from a rudimentary ΔΧ1 wheel.

Take this through the rectangle, getting ΔΧ2A, similarly ΔΧ2B, ΔΧ2C, Χ2D, ΔΧ2E, each a column of scores, not merely dots and crosses.

Make a flag of these five ΔΧ2's by Jacob's method.

Choose 2, 3, 4 or 5 of these, and, with the appropriate ± signs add them. The high scoring characters can be used as a start.
  Depth 4-6 6-8 8-10 10-12 12-14 14-16  
  Standard 4 5 6 7 8 9  


(f) Restarts.

At the end of a convergence the characters used in the start are liable to score unduly well; but even if the start is a poor one, some of the characters for which the rectangle really does provide strong evidence should also score well (R3 p 16). If high scoring characters which appeared late in the convergence are taken as a new start, a better convergence may be obtained. (R2 p 101, R3 p 98.)

.

(g) E 1.

An elaborate variation on restarts is E 1 for which the instructions are:-

Make a start by eye

Purge

Take 5 characters as a new start

Purge again

Each purge involves the following:-

Suppose the eye-start is ΔΧ2α of 3 to 5 characters. Take ΔΧ2α through the rectangle getting ΔΧ1α of 6-10 characters. Take ΔΧ1α through the rectangle getting ΔΧ2β of 8-12 characters, in choosing which, reduce the score of any character which was in ΔΧ2α by one-third. Take ΔΧ2β through the rectangle getting ΔΧ1α of 5-10 characters, excluding all characters which were in ΔΧ1β. (R4 p 3; for random starts R1 p 93.)


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